Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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62301-1452
The present invention relates to a contalner with printed
informatlon and in partlcular to a dispoæable plastic bottle. The
invention further relates to a method of manufacturing a container
blank and to the container blank.
Various different containers are known of the type with
informatlon printed on a cylindrical, conical or plane surface in
order to permit mass production of the container with printed
informatlon.
It is the ob~ect of the present invention to provide a container
of the above type, which is suited for mass production, has an
agreeable external appearance and is pleasant to handle.
The invention provides a container with printed information
thereon comprising a base and a shoulder interconnected by walls,
each wall having a hyperboloidal surface extending substantially
from said base to 6ald shoulder whereln planes pas~ing through the
longltudinal axls define a hyperbola at the lntersectlon of sald
wall~ and planes at acute angles to and lntersecting the
longltudlnal axis to form a series of straight llnes at the
intersectlon of said walls whereby a screen and doctor blade can
be placed at an acute angle to the longitudinal axis o the bottle
to be in a stralght llne contact wlth the bottle and to permit
screen printlng onto said bottle. As a result a contalner is
obtained with an agreeable external appearance, and which is
pleasant to handle and simultaneously particularly suited for mass
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62301 1452
production.
The invention also provides a method for printing directly onto
the hyperboloidal surface of a container which has a shoulder
portion and a base portion connected by a hyperboloidal wall
portion comprising contacting the hyperboloidal wall portion with
a silk screen and doctor blade, the silk screen and doctor blade
being at an acute angle to the longltudinal axis of said container
so as to put the screen and doctor blade in a line contact with
the surface of the hyperboloidal wall por~ion of said container,
and synchronously moving the doctor blade and contalner so as to
print onto the surface of the hyparboloidal wall portion of said
contalner.
The doctor and consequently its line of contact with the screen
are placed as generatrix for the hyperbololdic surface or the
hyperbololdic-llke surface to be prlnted on, whereafter the doctor
and the screen are moved relatlve to each other and to the surface
to be prlnted on ln such a manner that the print produclng part of
the screen remains ln llne contact with sald surface along a
generatrlx. Thls lmplies that lt is posslble very qulckly and
ratlonally to apply print to hyperbololdlc surfaces or
hyperbololdlc-llke surfaces with a rectlllnear generatrix, whereby
the degree of freedom wlth respect to the construction of the
aontalner 18 increased conslderably.
The screen may be stationary while the doctor and the contalner
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62301-1452
blank are moved synchronously in relatlon to each other.
Consequently, the method becomes very slmple and easily
practicable.
An expedient plastic container blank for manufacturing the
container according to the invention, in particular a plas-
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tic bottle for liquid, powdered or pastelike cleaning ma-
terials or detergents, said container blanc comprising a
closable opening, and where a horizontal section through the
wall of the container blanc in its upright position de-
scribes a convex curve, preferably substantially an ellipse
or a circle, is characterized in that at least portions of
the wall of the container blanc describe one or several
hyperboloidic surfaces or hyperboloidic-l~ke surfaces.
Such a container will, when containing sn oxygen absorbing
medium, not be visibly deformed when the medium absorbs
the oxygen and partlal vacuum arises inside the container.
This is particularly due to the fact that a relative ro-
tation, caused by the partial vacuum, between the upper and
lower parts of the container blanc, round the longitudinal
axis of the container blanc will not be visible provided
part of the wall of the contalner blanc is a hyperboloidic
surface ant or a hyperboloitic-like surface. This is opposed
to what woult be the case ii` the wall of the container
blanc was e.g. a cylindrical surface, which would dent if
a partial vacuum should arise in the container blanc.
In a preferred embodiment of the container according to
the invention the container has a substantially elliptic
cross-section, ant the wall of the container blanc com-
prises two pairs of hyperboloitic surfaces mutually sym-
metrical about two mutually perpendicular symmetry planes.
A container blanc is consequently obtained with an agreeable
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131'1S9'~7
external appearance and which is pleasant and easy to han-
dle.
The invention will be described more detailed below with
reference to the accompanying drawing, in which
Fig. 1 is a s~de view of a container according to the in-
vention with printed information,
r~ Fig. 2 is a ~e~ view of the container of Fig. 1,
Fig. 3 illustrates the cross-section geometry of the con-
tainer along the line III-III of Fig. 2, and
Fig. 4 is a schematic view of a method according to the
invention for applying print to a hyperboloidic surface .
Figs. 1 ~nd 2 are a s~de view and a top view, respectively,
of a preferred embodiment of a container 10 according to
the invention with printed information. The areas 12, 14,
of the container 10, on which information has been printed,
is illustrated by dotted lines. The container 10 compr~ses
a body 16 which at the top passes into a shoulder 18 and
at the bottom into a base 20. The shoulder 18 is substan-
tially conical, is tllted in relation to the longitudinal
axis 22 of the container and passes at the top into a neck
24 provided with a closable opening. The base 20 extends
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from the body 16 in ~ slightly conical downward direction
to form the support surface 26 of the container 10.
As shown in Fig. 3 the body 16 has a substantially elliptic
cross-section and consists of two pairs of hyperboloidic
surfaces 28, 30, and 32, 34, respectively, which are mu-
tually symmetric about two mutually perpendicular s~mmetry
planes. The areas 12, 14 with pr~nted information form
part of the hyperboloidic surfaces 32, 34. As it appears
from Figs. 1 and 2 the greatest dimensions lmaX, b~aX of
the container along the two symmetry planes of the body 16
are the same at the shoulder 18 and at the base 20, and
the body 16 has its smallest dimensions lmin, bmin at the
waist-curve s, cf. Fig. 3, for the two pairs of symmetrical
hyperboloidic surfaces 28, 30 and 32, 34, respectively.
This implies thst the containers will stand steadily and
stably when packed in e.g. a cardboard box.
The container blanc may be manufactured by blow moulding
and is particularly suited for stretch blow moulding.
The container blanc is preferably made of pla~tic material,
o.g. of the type polyethylene (PE), polypropylene (PP),
polyethylene terephthslate (PET),polyethylene terephthalate
glycol (PETG), polyvinyl chloride (PVC), acrylonitrile
(AN) ant copolymers thereof. The said materials may also
contain a reinforcing material such as fibre glass.
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As a result of the use of hyperboloidic surfaces 28, 3~; 32,
34 for the formation of the body 16 there i9 no visible de-
formation of the container blanc 10, when partial vacuum
arises therein. Partial vacuum occurs in container blancs,
when said container blancs contain an oxygen absorbing
med$um, e.g. a medium containing aldehydes or unsaturated
fatty acids, and the container blanc during filling is not
filled completely, as the medium will then after some time
absorb the oxygen. Due to the partial vacuum formed, the
upper part of the container blanc (here the shoulder 18)
will rotate in relation to the lower part of the container
blanc (here the base 20), and as a result there will be a
dent on the body (here 16~, if the container doe~ not - as
in the present invention - consist of hyperboloidic surfaces
28, 30, and 32, 34, respectively, or hyperboloidic-like
surfaces.
The inventive method for applying print, preferably seri-
graphy, to a hyperboloidic surface or a hyperboloidic-like
surface of a container blanc is schematically illustrated
in Fig. 4. The Figure illustrates a hyperboloidic surface
40, to which serigraphy should be applied. In serigraphy a
toctor blade 42 is applied, which in contact with a planar,
flexible silk screen 41 (illustrated with a dot-and-dash
line) moves relative to the silk screen 41 and thus presses
ink through the masks of the silk screen 41 and onto the
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13()~94'-7
surface to be printed on, i.e. in the present case the
hyperboloidic surface 40, said surface moving synchronously
in relation to the movement of the doctor in such a manner
that there is constant line contact between the surface to
the printed on and the silk screen 41, and between the silk
screen 41 and the doctor 42, respectively. In the method ac-
cording to the invention the doctor 42 snd consequently
its line of contact with the silk screen 41 are placed as
generatrix for the hyperboloidic surface 40 to be printed
on, whereafter the doctor 42 moves rectilinearly across
the silk screen 41, which stands still, and simultaneously
the hyperboloidic surface i8 partly rotated and partly
moved translatively synchronously with the movement of the
doctor 42, 80 that the print causing part of the silk screen
41 remains in line contact with the said surface along a ge-
neratrix to the hyperboloidic surface 40.
It is thus possible by mesns of the method according to
the invention to apply print to sn arbitrarily formed sur-
fsce which can be formed by propagating a rectilinear ge-
neratrix_along sny plsnoconvex tirectrix the generatrix
generally not being surface normal compared to the plane
of the directrix. The hyperboloide is a specisl example
thereo~, a8 the cur~ed guide ls here sn ellipse or in con-
nection with an rotary hyperboloide a clrcle.
